Dark Energy Survey Year 3 Results: Constraints on extensions to $\Lambda$CDM with weak lensing and galaxy clustering

Understand

We constrain extensions to the $\Lambda$CDM model using measurements from the Dark Energy Survey's first three years of observations and external data.

• The DES data are the two-point correlation functions of weak gravitational lensing, galaxy clustering, and their cross-correlation.
• We use simulated data and blind analyses of real data to validate the robustness of our results.
• In many cases, constraining power is limited by the absence of nonlinear predictions that are reliable at our required precision.